package com.itheima.System.test;


import com.itheima.System.domain.Student;

import java.util.ArrayList;
import java.util.Scanner;

public class StudentManager1 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        ArrayList<Student> list = new ArrayList<>();
        while (true) {
            System.out.println("----欢迎来到学生管理系统----");
            System.out.println("1,添加学生");
            System.out.println("2，删除学生");
            System.out.println("3，修改学生");
            System.out.println("4，查看学生");
            System.out.println("5，退出");
            System.out.println("请输入您的选择:");
            String choice = scanner.next();
            switch (choice) {
                case "1":
                    addStudent(list);
                    break;
                case "2":
                    //removeStudent(list);
                    deleteStudent(list);
                    break;
                case "3":
                    updateStudent(list);
                    break;
                case "4":
                    queryStudent(list);
                    break;
                case "5":
                    System.out.println("感谢您的使用!");
                    return;
                default:
                    System.out.println("您输入的数据有误!");
                    break;
            }
        }
    }

    public static void updateStudent(ArrayList<Student> list) {

        if (list.size() == 0) {
            System.out.println("无数据,请输入数据后查询!");
            return;
        }
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入要修改的学号:");
        String sid = sc.next();
        int index = getIndex(list, sid);
        if (index == -1) {
            System.out.println("查无此学号");
            return;
        }
        System.out.println("请输入姓名:");
        String name = sc.next();
        System.out.println("请输入年龄:");
        int age = sc.nextInt();
        System.out.println("请输入生日:");
        String birthday = sc.next();
        Student student=new Student(sid,name,age,birthday);
        list.set(index,student);
        System.out.println("修改成功");

    }

    public static void deleteStudent(ArrayList<Student> list) {
        if (list.size() == 0) {
            System.out.println("无数据,请输入数据后查询!");
            return;
        }
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入要删除的学号:");
        String sid = sc.next();
        int index = getIndex(list, sid);
        if (index == -1) {
            System.out.println("查无此学号");
            return;
        }
            list.remove(index);
            System.out.println("删除成功");

    }

   /* public static void removeStudent(ArrayList<Student> list) {
        list.

    }*/

    public static void addStudent(ArrayList<Student> list) {
        Scanner sc = new Scanner(System.in);
        String sid;
        while (true) {
            System.out.println("请输入学号:");
             sid = sc.next();
            int index = getIndex(list, sid);
            if (index==-1){
                break;
            }
        }
        System.out.println("请输入姓名:");
        String name = sc.next();
        System.out.println("请输入年龄:");
        int age = sc.nextInt();
        System.out.println("请输入生日:");
        String bir = sc.next();
        Student student = new Student(sid, name, age, bir);
        list.add(student);
        System.out.println("添加成功!");
    }

    public static void queryStudent(ArrayList<Student> list) {
        if (list.size() == 0) {
            System.out.println("无数据,请输入数据后查询!");
            return;
        }
        System.out.println("学号\t\t姓名\t年龄\t生日");

        for (int i = 0; i < list.size(); i++) {
            Student student = list.get(i);
            System.out.println(student.getSid() + "\t" + student.getName() + "\t" + student.getAge() + "\t\t" + student.getBirthday());
        }
    }

    public static int getIndex(ArrayList<Student> list, String sid) {

        int index = -1;
        for (int i = 0; i < list.size(); i++) {
            Student stu = list.get(i);
            String s = stu.getSid();
            if (s.equals(sid)) {
                index = i;
            }
        }
        return index;
    }
}
